Aliyah was the mass immigration of Soviet Jews during the 1970s to Israel after the Soviet Union lifted its ban on Jewish Refusenik emigration.
In 1967, the USSR broke diplomatic relations with Israel in the wake of the Six-Day War. During this time, popular discrimination against Soviet Jewry increased, led by an anti-Zionist propaganda campaign in the state-controlled mass media. By the end of the 1960s, Jewish cultural and religious life in the Soviet Union suffered from a strict policy of discrimination. This state-sponsored atheism movement denied Jews the ethnic-cultural rights experienced by other Soviet ethnic groups.
After the Dymshits–Kuznetsov hijacking affair in 1970 following the crackdown, international condemnations caused the Soviet authorities to increase emigration quotas. Between 1960 and 1970, only 4,000 people had left the USSR. The number rose to 250,000 in the following decade.
In 1972, the USSR imposed a so-called "diploma tax" on would-be emigrants who had received higher education in the USSR. The fee reached as high as twenty times an annual salary. This measure was designed to combat the brain drain caused by the growing emigration of Soviet Jews and other members of the intelligentsia to the West. Following international protests, the Kremlin soon revoked the tax, but continued to sporadically impose various limitations.
Prior to the Six-Day War, few Soviet Jews emigrated to Israel. Israel's decisive victory changed the opinion of many Soviet Jews towards Israel. After the war, many Soviet Jews began to demand the right to move to Israel. However, given a choice, many Soviet Jews chose to emigrate to the US.